ArcEngine要素转点，要素节点转点

要素转点，要素节点转点"/>

ArcEngine要素转点，要素节点转点

虽然有方便的GP工具FeatureVerticesToPoint。然而其需要最高权限，某些时候没法使用，可以用下面的函数作为替代。

        /// <summary>/// 要素节点转点/// </summary>/// <param name="IN_Featureclass">要转换的要素类</param>/// <param name="IN_FeatureDataset">要生成转换后要素类的要素数据集</param>/// <returns>生成的点要素类</returns>private IFeatureClass PRV_FeatureVerticesToPoints(IFeatureClass IN_Featureclass,IFeatureDataset IN_FeatureDataset){//创建要素类IFeatureClass Temp_VPFeatureClass =IN_FeatureDataset.CreateFeatureClass(IN_Featureclass.AliasName + "_VPoints", PRV_SetFields(IN_Featureclass), null, null, esriFeatureType.esriFTSimple, "Shape", "");//提取所有要素IFeatureCursor Temp_GetEachFeature = IN_Featureclass.Search(null, false);IFeature Temp_EachFeature = Temp_GetEachFeature.NextFeature();if (Temp_EachFeature != null){IWorkspaceEdit Temp_WorkspaceEdit = (IWorkspaceEdit)Temp_WorkspaceEdit.StartEditing(true);Temp_WorkspaceEdit.StartEditOperation();IFeatureBuffer Temp_FeatureBuffer = Temp_VPFeatureClass.CreateFeatureBuffer();IFeatureCursor Temp_FeatureCursor = Temp_VPFeatureClass.Insert(true);//将点存入要素类while (Temp_EachFeature != null){//获取要素的点集IPointCollection Temp_Vertices = Temp_EachFeature.Shape as IPointCollection;for (int i = 0; i < Temp_Vertices.PointCount - 1; i++){Temp_FeatureBuffer.Shape = Temp_Vertices.Point[i];Temp_FeatureCursor.InsertFeature(Temp_FeatureBuffer);}Temp_EachFeature = Temp_GetEachFeature.NextFeature();}Temp_FeatureCursor.Flush();Temp_WorkspaceEdit.StopEditOperation();Temp_WorkspaceEdit.StopEditing(true);//清理资源并返回System.Runtime.InteropServices.Marshal.ReleaseComObject(Temp_GetEachFeature);}return Temp_VPFeatureClass;}

该函数的辅助函数

  private IFields PRV_SetFields(IFeatureClass IN_Featureclass)//设字段的函数{//创建必要字段IFeatureClassDescription Temp_FeatureClassDescription = new FeatureClassDescriptionClass();IObjectClassDescription Temp_ObjectClassDescription = (IObjectClassDescription)Temp_FeatureClassDescription;IFields Temp_Fields = Temp_ObjectClassDescription.RequiredFields;int Temp_ShapeFieldIndex = Temp_Fields.FindField(Temp_FeatureClassDescription.ShapeFieldName);IField Temp_RequiredField = Temp_Fields.get_Field(Temp_ShapeFieldIndex);//设定几合字段IGeometryDef Temp_GeometryDef = Temp_RequiredField.GeometryDef;IGeometryDefEdit Temp_GeometryDefEdit = (IGeometryDefEdit)Temp_GeometryDef;Temp_GeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;ISpatialReferenceFactory Temp_SpatialRefFac = new SpatialReferenceEnvironmentClass();//以备用点为模板构建空间参考Temp_GeometryDefEdit.SpatialReference_2 = (IN_Featureclass as IGeoDataset).SpatialReference;//验证字段IFieldChecker Temp_FieldChecker = new FieldCheckerClass();IEnumFieldError Temp_FieldsError = null;IFields Temp_AllRightFields = null;//验证无误的字段集Temp_FieldChecker.ValidateWorkspace = (IWorkspace)FDS_MainFeatureDataset.Workspace;Temp_FieldChecker.Validate(Temp_Fields, out Temp_FieldsError, out Temp_AllRightFields);//添加"原图形的OID"字段IFieldsEdit Temp_FiledsEditor = Temp_AllRightFields as IFieldsEdit;IField Temp_OriginOIDFields = new FieldClass();IFieldEdit2 Temp_FiledEditor = Temp_OriginOIDFields as IFieldEdit2;Temp_FiledEditor.Type_2 = esriFieldType.esriFieldTypeInteger;Temp_FiledEditor.Name_2 = "OriginClassOID";Temp_FiledsEditor.AddField(Temp_OriginOIDFields);return Temp_AllRightFields;}

经测试，该方法只在 数据量小时起作用，数据量过大会出错（本人测试32000个面转到15000个面就报错了） ，效率远远低于GP工具。估计GP工具采取了某些底层算法，处理60万点在160秒内（i5-6500,8G），本函数处理15000个面也需要超过10分钟时间。

如果有好方法也可以分享一下。

附GP工具的函数：

 //面转节点（GP法）private IFeatureClass PRV_FeatureVerticesToPoints_GP(IFeatureClass IN_Featureclass,IFeatureDataset FDS_MainFeatureDataset){//要素数据集地址string Temp_FeaturedatasetPath = FDS_MainFeatureDataset.Workspace.PathName + "\\" + FDS_MainFeatureDataset.Name + "\\";//面转点Geoprocessor GP_Tool = new Geoprocessor();//GP运行工具FeatureVerticesToPoints GP_FeatureVerticesToPoint = new FeatureVerticesToPoints();GP_FeatureVerticesToPoint.in_features = Temp_FeaturedatasetPath + IN_Featureclass.AliasName;GP_FeatureVerticesToPoint.point_location = "All";GP_FeatureVerticesToPoint.out_feature_class = Temp_FeaturedatasetPath + IN_Featureclass.AliasName+"_VP";GP_Tool.Execute(GP_FeatureVerticesToPoint, null);//获取生成的要素类IFeatureClass Temp_FeatureClass = (FDS_MainFeatureDataset.Workspace as IFeatureWorkspace).OpenFeatureClass(IN_Featureclass.AliasName + "_VP");return Temp_FeatureClass;}

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